/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.iotdb.db.queryengine.plan.relational.planner;

import org.apache.iotdb.db.queryengine.plan.relational.sql.ast.SortItem;

public class OrderingTranslator {
  private OrderingTranslator() {}

  public static SortOrder sortItemToSortOrder(SortItem sortItem) {
    if (sortItem.getOrdering() == SortItem.Ordering.ASCENDING) {
      if (sortItem.getNullOrdering() == SortItem.NullOrdering.FIRST) {
        return SortOrder.ASC_NULLS_FIRST;
      }
      return SortOrder.ASC_NULLS_LAST;
    }

    if (sortItem.getNullOrdering() == SortItem.NullOrdering.FIRST) {
      return SortOrder.DESC_NULLS_FIRST;
    }
    return SortOrder.DESC_NULLS_LAST;
  }
}
